Battery Pack Voltage Tapping With Galvanic Isolation
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Solution Overview
Problem
Existing energy storage systems (ESS) for electric and hybrid electric vehicles require high voltage converters to convert high voltage from the ESS to low voltage for auxiliary systems, which increases space, cost, and development complexity.
Innovation Solution
The ESS includes a high voltage system with battery cells connected in series and parallel to provide a traction voltage, and a regulator that connects between the battery cells to extract lower voltage levels and regulate them, providing galvanic isolation between high and low voltage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage converters are used to convert high voltage from ESS to low voltage, then voltage conversion is achieved, but space occupation increases
Solution Approach 1:
The patent extracts the voltage conversion function from the battery pack by utilizing the inherent voltage differences between series-connected battery cells. Instead of using an external high voltage converter, the system directly taps into intermediate voltage points between battery cells to obtain low voltage output, thereby eliminating the need for separate conversion equipment and reducing space occupation.
Solution Approach 2:
The battery pack serves multiple functions: it provides high voltage for traction motors while simultaneously providing low voltage for auxiliary systems through intermediate taps. This multi-functionality eliminates the need for dedicated voltage conversion equipment, reducing both space and complexity.
2Power
If high voltage converters are used to convert high voltage from ESS to low voltage, then voltage conversion is achieved, but product cost increases
Solution Approach 1:
The patent extracts the voltage conversion function from the battery pack by utilizing the inherent voltage differences between series-connected battery cells. Instead of using an external high voltage converter, the system directly taps into intermediate voltage points between battery cells to obtain low voltage output, thereby eliminating the need for separate conversion equipment and reducing space occupation.
Solution Approach 2:
The battery pack serves multiple functions: it provides high voltage for traction motors while simultaneously providing low voltage for auxiliary systems through intermediate taps. This multi-functionality eliminates the need for dedicated voltage conversion equipment, reducing both space and complexity.
3Power
If high voltage converters are used to convert high voltage from ESS to low voltage, then voltage conversion is achieved, but development cost increases
Solution Approach 1:
The patent extracts the voltage conversion function from the battery pack by utilizing the inherent voltage differences between series-connected battery cells. Instead of using an external high voltage converter, the system directly taps into intermediate voltage points between battery cells to obtain low voltage output, thereby eliminating the need for separate conversion equipment and reducing space occupation.
Solution Approach 2:
The battery pack serves multiple functions: it provides high voltage for traction motors while simultaneously providing low voltage for auxiliary systems through intermediate taps. This multi-functionality eliminates the need for dedicated voltage conversion equipment, reducing both space and complexity.
4Power
If connectors are placed between battery cells to extract low voltage, then low voltage extraction is achieved, but galvanic isolation is compromised
Solution Approach 1:
The patent introduces a galvanic isolator as an intermediary component between the battery pack and the low voltage system. This isolator maintains electrical isolation while allowing power transfer, thus preserving safety requirements while enabling low voltage extraction from intermediate battery cell connections.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for the extraction of stable low voltage levels from the high voltage system, reducing the need for high voltage converters and thereby decreasing space, product cost, and development cost, while providing flexible voltage and current levels for various applications.
Implementation Method 1
at least one regulator connected to the at least one connector and the at least one regulator is configured to regulate the output voltage level of qx V provided by the at least one connector and isolate a low voltage system from the high voltage system in the vehicle
Data Source
AI summary
A vehicle comprising an ESS is disclosed. The ESS comprises a battery pack with a number of battery cells, at least one connector connected to at least two battery cells connected in series, for providing an output voltage level of qx V which is lower than the maximum traction voltage level of ax V. The ESS may further comprise at least one regulator connected to the at least one connector. The at least one regulator is configured to regulate the output voltage provided by the at least one connector and isolate the low voltage system from the high voltage system in the vehicle.